OpenLDAP killed by mysterious assailant

["Justin Schwartz" <justin@ivorytower.co.za>]

Hi all,
  We are running OpenLDAP 2.0.15 on RedHat 7.1.  We are using JNDI to talk
to OpenLDAP and everything runs fine for most of the time.  However,
sometimes OpenLDAP shuts down as if someone (or something) asked it to stop;
this doesn't happen when something particular occurs (i.e. authentication,
retrieving serialized objects, etc).  Furthermore, some data is lost! This
is what happens, literally at random:

...
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
daemon: shutdown requested and initiated.
slapd shutdown: waiting for 0 threads to terminate
slap_sig_shutdown: signal 2
slap_sig_shutdown: signal 2
slapd shutdown: initiated
ldbm backend syncing
ldbm flushing db (/usr/local/var/openldap-ldbm/dn2id.gdbm)
ldbm closing db (/usr/local/var/openldap-ldbm/dn2id.gdbm)
ldbm flushing db (/usr/local/var/openldap-ldbm/id2entry.gdbm)
....

any ideas?

::::::::::::::::::::::::::::::::::
Justin Schwartz
Analyst / Developer
Ivory Tower
[phone] : +27 21 418 8230
[fax]   : +27 21 425 4537
[e-mail]: justin@ivorytower.co.za
[mobile]: +27 82 487 3821
[web]   : www.ivorytower.co.za